Combine & Compress (css, js)
According to Yahoo!'s Exceptional Performance Team , 40% to 60% of Yahoo!'s users have an empty cache experience and about 20% of all page views are done with an empty cache (see this article by Tenni Theurer on the YUIBlog for more information on browser cache usage ).
News 2012-03-10 Minify 2.1.5 released! We've also converted to git and are mirroring at GitHub .
Closure Compiler - Компресия на кода